Machine for engraving molds



A. A. BUSH AND R. H. FREITAG.

MACHINE FOR ENGRAVING MOLDS.

APPLICATION FILED OCT. IS, 1919.

Patented July 19, um J "6 SHEETS SHE iT r'cr.

A. A. BUSH AND R. H. FREITAG.

MACHINEFOB ENGRAVING MO LDS. APPLICATION FILED 007218. 1919.

Patented July 19, 1921.

6 SHEETS-SHEET 2.

.llllkh. Lkf .LLI L wfiwezzra v mtim.

A. A. BUSH AND R. u. FREITAG.

MACHINE FOR E NGRAVING MOLDS.

Patented Ju1y 19 1621.

6 SHEETS-SHEE" 3.

APPLiCATlON FILED OCT. I8, 1919.

XII.

A. A. BUSH AND R. H. FREITAG MACHINE FOR ENGHAVING MOLDS. APPLICATION FILED OCT. 18, 1919.

1,385,333. Patented July 19,1921.

6 SHEETS-SHEET 4- A. A. BUSH AND R. H. FREITAG. MACHINE FOR ENGRAVING MOLDS.

APPLICATION FILED OCT. 18, I919.

Patented July 19, mm.

. following is kt UNIT-ED STATE-S m'ren AMBER? A. IEUZFSH AND RICHMH) H. liJEl-EITAG, t'fllli AKHUN', ;'t]l'l-"l'.Itl,

FIR'ESEWONE TIRE AND R'UIlTsllilIrt GOMI'ANY, ll}? .ltllliltt'lll',

1,335,333, Speeifieation of L Application filed October 18, 19W.

titlll new and useful Improvements in Mae chines lor lllngmving Molds, of which the eeiiiention.

This invention zrelates to a machine lor the pulrpooe of engraving deeigns on molds in Whieh tires are vulcanized. The designs are engraved on the outer rounding surface of the molcl halves "and mentor the purpose of giving the treml oi? the tiie the rough or nonsh'id lenturee. The cutting of the designs in tire 131ml has; hitlnn'to presented 11. greet runny dlllionlties end has been n-slowi and tedious process, but by the machine shown herein the time of cutting is greatly reduced and the wor is done more accuratel than by methoc s pheviouely in use, and the most intricate patterns may be easily repyotlueed in the mold.

It will he hnderswod that the showing and deeeiil ptlon ofthe mold engraving moehine as embodied in this aIJIlllUlItljlUlil is for the purposes of disclosure of the i1 ention only, and is not in. any sense limiting, the intention is susceptible of embodiment in runny dill" ant lorms, such fomoe heingg ineluded in invention.

Figure 1 a hut elevation of the mold ehgi'iwlng ineehine.

Fig. F2. is a eloe elevation.

17". is a. plenview;

Fig. 4 is an enlarged major portion of the machine showing the eotting head raised out of the operative position.

Fig. 5 loan enlarged section through the hem] end table- Showing the tool in cutting position.

I guillewey fen Fig. 6 1s auhorizontalseetion through the hotter supporting m'rriage.

Fig. 'l' is an end view of the cutting or milling head.

Fig. 8 is a Section on the line 8-43, Fig. 5.

Fig. 9 is at section on the line 9 9, Fig. 5.

The meohinefeomprises a table or base upon "which iefrotatebly mounted a mold carrying tfnrn table, and nleo a. vertieal eustnining a. enridnge which in 5 n heed in whieh rotated n he lower and of which Supports turn sup tool she-f gmhh. to

front elevation of the shaft 13, holcll'u cutting o mi and moltll'Jl' mm nntl eonetri lUlUtl or pmiitogi'npl eon he 11001. the mold to ee In the drew LIll whieh of the nlwzhine. plate 1 is; see upper soil-loco o1. eiroulz with o. V-ehnpeo 4: roeeivel o about the eentetmil '2" mo tahle or platform. meme provided if trelly thereon.

In the mnehine herein mechanisms by which l ll the eehter i). ohe lnelno ll tile pin-5 e olfilollowmg the pottei'h or photo-- he leten [lest (l, ltllfl the other the moli'l to enrol to engglrove 21 new Hill The li'lret memo for moving the table, thoxt lo liar folio ein e unit ooh o the with is H mrm llMllCitll ll llh mm is eeeo'lrofl'to log plete El l e the hose plate 11., jeeting over the eitle Uh eeourefl thereto n ill. base plate 1. below the i oil oil the to lt'l formed a hearing .lEl llil "Whleh in motivell a y e set screw l. Uh the owl support n. em" why llltl of this she ft l which 15 so 211" tinged to ineeh "wt .i l l we gem? segment 11., when the molrl .hnypportmgg table is set in. its; ope *utive poeitio h as shown in Fig. 3. On the end of the ethaft 1.3 in loosely mounted an operatinglever It, being provided with a slot l7 Wl'llfill pastes oven the enrl of; the shaft, and being pl'eegecl town-rel the near by a Spring 18 omnmhullng the shaft and held in plnee hjgfl it wnsllei" oi" plete 19. One eml oi"- the lever iejeztteiidedto pro- Side a handle Q0, and the othet end is fmmed til operating crank 31.

.30 carries a dish 32 which may be graduated accurate setting or duced in the mold.

faces of these standards with forks 21 to which is pivotally connected an. car 22 of a lever fulcrum plate 23 which passes over the shaft 13. The outer face of the gear is formed with a rib or flange 2d, in the surface of which is a series of notches 25 into any one of which the shank of the lever may be received.

In the operation of the parts described, when it is desired to move the mold about its center to cut the desired pattern, theoperator raises or lowers the lever 16 which in turn movesthe operating arm 10 to and fro about the center pin 7. To allow a greater extent of movement, the lever 16 may be moved outwardly, pivoting at 22, and another notch 25 engaged by the shank thereof.

In all tire mold designs there is a constant repetition of a single unit or sector and the pattern or pantograph used in this machine is designed to include one unit. When a unit has been completely engraved, the mold is turned about its center to bring a new area under the milling tool. In order to accomplish this purpose the mold supporting platform 8 is provided with means for rotatit on the intermediate bearing plate 6. To the underside of the plate 8 and surrounding the plate 6 is a gear ring 26, the

outer face of which is provided with a two part worm gear 27 meshing with a worm 28 on a shaft 29. The last named shaft is received in a sleeve 80 which extends laterally from the arm 10 and projects beyond the table 8, the she-rt being provided with an The end of the sleeve in any well-known r inner to provide for mold. Any suitable for locking the platform may be pro On the operating arm 10is carried a table i the upper face of which is secured the tern, teuiplet or pantograph 34 which is cut out in such shape as to generate one of the units of the design desired to be repro- .lrorn the rear of the. bed plate rises a pair of standards 35, the upper ends of which overhang the operating arm 10. The front are formed as rails 36 olj which is slidably mounted a vertically mov flg carriage 37, the same being held in. any position of vertical adjustment by a screwshaft 38 supported at its upper end in abridge piece 39 across the standards, and provided with a hand wheel 40. On the face of the carriage 37 is formed a pair of guideways 41 in which is horizontally slidable a second carriage 42. In the rear of this carriage is arranged a longitudinal screw shaft 63 which engages with a nut 64 secured to the slide 37 by means of which an initial adjustment of the carriage 12 may obtained. On the face of the carriage are formed dove-tail guide rails in which is received a shiftable tool guiding slide or stylus carrier 43, the rear face of which is provided with a nut 44, threaded on all operating shaft 45 rotatably mounted in the carriage 42 and provided with a crank wheel 46. To prevent any lost motion between the tool guiding slide and the screw there is provided a pair of lock nuts 47, one of which is contacted by a set screw 4-8.

Through a boss 49 in the slide 43 is slidably mounted a pin 50, the lower end of which may be provided with a roller, which is received in the tcmplet or pattern 34-. The pin 50 may be termed a stylus or templet follower and is guided about the pattern as will appear. The head 51 of the stylus is provided with an eccentrically arranged set screw 52 which bears on the carriage and by which the depth is adjusted.

The end of the carriage or stylus carrier 43, remote from the screw, carries a pin or pivot 53 on which is mounted a link ill which serves to rock the milling head. The end of the intermediate slide 42 toward the table is provided with a bearing 55 having a centrally arranged boss 56 over which is fitted a head 57, the end of which is curved downwardly and serves as a fulcrum for the milling tool carrier indicated generally by the numeral 58. The link 5e extends through the hollow portion of the fulcrum head 57 and is pivotally connected to lugs 55) by a pin 60.

The fulcrum 57 of the milling tool head or carrier is so arranged that it can be adjusted in position to be at the center of ourvature of the outer surface of the tread of the tire (see Line A, Fig. 5). The milling tool head is arranged with a lougitlulinal bore in which is slidably mounted a bushing 61. Interiorly of the bushing is received a sleeve in which isrotatably mounted the central portion 66 of a spindle 67.

Below the sleeve 65 the spindle is pro vided with a flange (i8 and above with two lock nuts 69 and 70. Between the lock nuts and the flange and the sleeve 65 are arranged ball bearings 71.

On the upper side of the bushing is secured a short rack 72 which meshes with a pinion 73, located centrally of a shaft 74 rotatably mounted in the milling cutter head 58. The shaft 74 is provided with a handle 75 by which it may be rotated to adjust the depth of the milling tool. A calibrated disk '76 may be secured to the shaft 74.

In order to lock the milling tool spindle in any desired adjustment, there is mounted in the head 58 below the rack and pinion a pair of sliding pins or dogs 77 which are prevented from turning by a key 78, and may be constantly urged apart by a coil spring indicated at 79 in Fig. 5. The lower inner ends of the pins are formed with are 10cm m1 mtisd wring 0011M. 91 designnd in 11011], Him 95h" up er and of M1 bolt/is pmvided with ahead Had Em mwh i'.

a l W115 Mia), miawznzmi m hm m (1L1 U nipulammm When m $51 mm, the

um m? Mum} Wmk imqntivt'mi in cm milling m" engraving W01 9925, the; 2011M My .l greatly wdmfidn ing art-waged. m be nymmtmi by 51 10mg WM; (3km ivnmi fliimhm 93 extending (Jim length of the spindlv'a. "Jfhfi in the 94 y which it my 1m mrm 100k nut 95 which hem-e: EILQZTM 611d; M the spindle,

t WiH have heels. e'vidw im H mm ka at driving mmms mcessm'y for i v IM 12 2% 66 as it is moved by the 111111: whim. by cutting mm. f 1 Uiilikg indwflw tampiet follower. Any amt/able 1110mm nmdmlt fiy' 11m :50 v'c Emmi 111 1m pmvided,-but in the aa'pec'ific ernbodii-- reach. my gm like mam mam; hemim .ahnwnmse is mmm a belt M31. cut, :1. mttmm #301 a, sect H passing WWW the illey 90 011 he m1 hmtl pmtmrn fullnwmg Mm m l 1 0mm in wing; c0-nifbl'm L. a the bieavimda L 3%; ml the Whig: 23. The veritimflly 1:1 1. riagga 3'? and thus huflzomrfliy 1mm Mg 22 4% aim 110w mijustm m bring t1. 0mm M the milling 15001 hmill in the mant 03f flmwm'm'nw 0f Hm line A.

him t h' pattern follower located at the other end of said arm, means to rock said armto cause the follower to trace the pattern, and means to rotate-the mold on the end of the arm.

5. In a; machine for cutting designs in a curved tire mold, the combination of a pivoted arm,;;a mold carrier on'the end of said arm, a-pattern carrier on the other end of said arm, a stylus, a pivoted cut ng head, connections from the stylus to the cutting head, means to move the stylus about the pattern, and means to rock the arm about its pivot. 6. In a machine for cutting repetitions of designs in a curved tire mold, the combination of a pivotally mounted mold table, the

' mold being secured to said table concentrically therewith, an arm connected with said table for moving the same about its pivot, a pivoted cutting head over the mold, a pattern and a pattern follower, one of said parts being connec ed to said cutting head and the other to the arm, and means independent of said arm for moving the table about its pivot to present a new section of the mold to the cutter.

7. In a machine for cutting designs in a curved tire mold, the combination of a pivoted arm, a mold carrier located concentrically with respect to the pivot of said arm, a pattern secured to the arm, a movable stylus carrier over the pattern, and a pivoted cutting head over the mold and a link connecting the stylus, carrier to the head.

8. In a machine for cutting designs in a curved tire mold, the combination of a pivoted arm, a mold carrier located concentrically with respect to the pivot of said arm, a pattern secured to the arm, a movable stylus carrier over the pattern, a pivoted cutting head over the mold, a link connecting the stylus carrier to the head, and means for rotating the mold carrier on the arm.

9. In a machine for engraving tire molds, a mold support, a vertically and horizontally movable carriage, an extension on said carriage adapted to be located over the mold, a cutting head pivoted in said extension over the mold, a rotatin cutter in the head, means to oscillate said cutting head, a pattern and pattern follower by which the movement of said head may be controlled,

and means to rotate the cutter during the oscillation of said head.

10. In a machine for engraving tire molds, a mold support, a vertically and horizontally movable carriage, an extension on said carriage adapted. to be located over the mold, a cutting head pivoted in said extension, a rotating cutter in said head, a stylus carrier slidably mounted on said carriage, a

the cutter during oscillation of the head,

and means to shift the mold support about the center of the mold? 12. In a machine for engraving tire molds, a mold support, a vertically and horizontally movable carriage, an extension on said carriage adapted to be located over the mold, a cutting head pivoted in said extension, a rotating cutter in said head, means to oscillate said cutting head, a pattern and pattern follower by which the movement of said head may be controlled, means to rotate the cutter during oscillation of the head, and means to shift the mold support about the center of the mold, and separate means to rotate the mold support to advance the mold circumferentially with respect to the cutter.

13. In a machine for engraving tire molds, a mold support, an adjustable carriage, a cutting head pivoted on said carriage, the fulcrum of said head being adapted to be positioned at the center of curvature of the mold, a rotating cutter in said head, means to oscillate said head, a pattern follower connected to said head oscillating means, a mold support pivoted at the center of said mold, a pattern carrier on said support, and means to rotate the cutter during its oscillation.

14.111 a machine for engravingtire molds, a mold support, an adjustable carriage, a cutting head pivoted on said carriage, the fulcrum of said head being adapted to be positioned at the center of curvature of the mold, a rotating cutter in said head, means to oscillate said head, a pattern follower connected to said head oscillating means, a mold support pivoted at the center of said mold, a pattern carrier on said support, means to rotate the cutter during its oscillation, and means to shift the mold on said support.

ALBERT A. BUSH.

RICHARD H. FHEITAG. 

